Split apps controllers into separate files

controllers/apps/index.js

@@ -0,0 +1,8 @@
+module.exports = {
+  createApp: require('./createApp'),
+  getSingleApp: require('./getSingleApp'),
+  deleteApp: require('./deleteApp'),
+  updateApp: require('./updateApp'),
+  reorderApps: require('./reorderApps'),
+  getAllApps: require('./getAllApps'),
+};